Attachment for sharpening band-saws.



No. 778,495. PATENTED OCT. 25, 1904. E. HARROLD & G. G. WILDERSON. ATTACHMENT FOR SHARPBNING BAND SAWS.

APTLIGATIDN FILED JAN. 22, 1904.

2 sums-sum 1.

N0 MODEL.

a flimerlrrald l mm WQ6ZW% PATENTED OCT. 25, 1904. E. HARROLD & C. G. WILDERSON. ATTACHMENT FOR SHARPBNING BAND SAWS.

APPLICATION FILED JAN. 22, 1904.

IIHHHHIH N0 MODEL.

UNITED STATES Patented October 25, 1904.

PATENT OFFICE.

ATTACHMENT FOR SHARPENING BAND-SAWS.

SPECIFICATION forming part of Letters Patent No. 773,495, dated October 25, 1904.

Application filed January 22,1904. Serial No. 190,180. (N0 odel- T 0 all whom, b't may concern:

Be it known that we, ELMER HARROLD and CLINTON G. TVILDERsoN, citizens of the United States of America, and residents of Leetonia, in the county of Oolumbiana and State of Ohio, have invented certain new and useful Improvements in Attachments for Sharpening Band- Saws, of which the following is a specification.

This invention relates to certain new and useful improvements in band-saws, and more particularly to an attachment applicable to band-saws now in use, and more especially applicable to this class of devices employed for cutting cloth and other soft material in which a knife-blade is employed instead of a saw and equipped with means whereby the blade may be sharpened or ground during the operation of the machine to keep the blade sharp.

The present invention has for its objects, among others, to provide an improved attachment of this character having provision for giving to the knife a long or a short bevel, as may be required, and at the same time provide for the adjustment of the grinder to suit the particular behavior of the blade, which latter has a tendency to run farther forward or back on the face of the band-wheel, so that it is not always an easy matter to bring the blade to the desired position on the wheels.

It has for a further object to simplify the device and render it less liable to derangement and yet providing for compactness, and'the drive-pulley is located at the rear of the machine, where it is out of the way.

The present construction is such as to permit of its ready attachment to the frame of an ordinary band-saw machine without any special modification of the band-saw proper.

The drive-pulley is located onthe side of the machine opposite the bandwheel, which has been found to be most convenient.

Other objects and advantages of the invention will hereinafter appear, and the novel features thereof will be particularly pointed out in the appended claims.

The invention in its preferred form is clearly illustrated in the accompanying drawings, which, with the numerals of reference marked thereon, form a part of this specification, and in which Figure 1 is a perspective view showing the application of the invention to a band-saw machine, sufficient only of the parts of the latter which are necessary ,to an understanding of the invention being illustrated. Fig. 2 is a vertical section on the line 2 2 of Fig. 3 looking in the direction of the arrows. Fig. 3 is a top plan View with parts in horizontal section. Figs. 2 and 3 are on an enlarged scale.

Like numerals of reference indicate like parts in the different views.

Referring now to the details of the drawings, 1 designates a portion of the frame of the band-saw machine, to which the attachment is to be applied. This may be of any of the well-known or preferred forms of construction, of which 2 is the knife-wheel or bandwheel, 3 the table, and 4: the band or knife, 5 the drive-shaft, 6 and 7 the pulleys thereon, the other parts shown and not specifically hereinafter described being understood as not pertaining per 86 to the present invention, but which may be of any of the well-known forms or of any suitable form operative to produce the usual results.

The present invention embodies an attach-- ment readily applied to the frame 1 of the old band-saw machine, and such parts will now be described.

8 designates a plate or casting from which are supported the parts comprising the invention, and this plate is designed to be attached to the frame of the machine in any suitable manner, usually by bolt 9, as seen in Fig. 3, the plate being provided with an extension 10 for this purpose and through the flange 11 of which the said bolt passes. This, however, is but one of the various ways in which the plate may be affixed in position. Rising from this plate is an arm 12, in which is pivotally held a bracket 13, the pivot 14: of which is provided with an adj Listing-nut 15, by which its position may be changed as may be required, and in this bracket are held the guide-plates 16, between which the band or knife 4 moves. These plates are adjustable in the body or bracket and adapted to be held in their adjusted position by suitable means, as a thumb-screw 17.

18 is a rocker-arm pivotally mounted on the plate 8, as at 19, the pivot passing through an elongated slot 20 in the said plate, as seen best in Fig. 2, and at its upper end receiving a cap 21 and a nut 22. This arm has depending from its under face a lug 23. which is adapted to have secured thereto in any suitable manner one end of a tension-spring 24, the other end of which is attached to a lug 25, extending from the plate 8, as seen best in Fig. 3.

26 is a lug rising from the plate 8 and receiving a thumb-screw 27, as seen clearly in Figs. 1 and 3, a jam-nut of any suitable form being provided, as seen at 28 in Figs. 1 and 3.

The outer end of the rocker-arm 18 has the tubular vertical portion or boss 29, in which is received the bushing 30, in which revolves the mandrel 31, which carries the emery-wheel 32 and the sheave-pulley 33, the said emerywheel and pulley being secured to the mandrel in any suitable manner to revolve therewith.

34; is the d rive-belt,preferably round, passed around the d rive-pulley 35 on the shaft 5 and around the sheave-pulley 33, as seen clearly in Fig. 1. This drivepulley, it will be noted, is on the rear of the machine on the side opposite the band-wheel, where 'it is not only out of the way, but where it can be readily gotten at without interfering with the other parts and the belt can easily be thrown ofl when it is not desired to employ the emerywheel.

The plate 8 is provided with a flange 36, as seen best in Figs. 1 and 2, to which are secured the idler-brackets 37 and 38, and each of these brackets carries an idlersheave 39 and etO, rcspcctively, around which passes the drivebelt 34C, as seen clearly in Figs. 1 and 3. These idler-sheaves are adjustable to keep the belt always tight and properly alined. This adjustment is provided in this instance by means of the slots atl in the idler-brackets, through which pass the screws 42, provided with suitable nuts &3, the said. screws being those that secure the brackets to the flange 36 of the plate 8, as seen clearly in all of the figures ot' the drawings.

Fig. 1 shows the attachment in position on the band-saw machine and ready for use. The drive-belt 34: being on thedrive-pulley and over the idlers and around the sheave 33, when the band is driven by the power applied to the shaft 5 the emery-wheel is also revolved, and being adjusted properly to contact with the band the latter is continuously sharpened.

It is to be noted that by the construction shown and above described the bevel of the knife-blade can be made long or short by simply loosening the nut 22 and sliding the rockerarm 18 backward or forward as required, the slot 20 permitting of this movement. It should also be noted that the hub part of the A freely.

cap 21 is a trifle longer than the thickness through the hub of the rocker-arm 18, as seen in Fig. 2, so that the nut 22 will not clamp the rocker-arm to the plate in a rigid manner; but the rocker-arm will be allowed to swing This rocker-arm has a further support on the plate near the emery-wheel,where it is allowed to slide. The emery-wheel is, as above described, adjustable to and from the knife-blade. It can be employed for grinding the blade sharp in the first place and also for keeping it sharp continuously during its operation. When it is desired to grind fast, the wheel is adjusted against the knife-blade by means of the thumb-screw 27 and held tightly in place by the thumb or jam nut 28. hen it is desired to grind more lightly, this oper ation is reversed and the spring 24 will operate to draw the wheel away from the blade. By this means a very fine adjustment can be obtained and that, too, without changing the tension of the drive-belt 34 in the least.

From the above it will be seen that we have provided a simple compact novel form of attaehment for band-saw machines, and while the structural embodiment of the invention as herein disclosed is what we at the present time consider preferable it is evident that the same is subject to changes, variations, and modifications without departing from the spirit of the invention or sacrificing any of its advantages. \Ve therefore do not intend to restrict ourselves to the details of construction hereinbefore set forth, but reserve the right to make such changes, variations, and modifications as come properly within the scope of the protection prayed.

W'hat is claimed as new is 1. An attachment of the character described, comprising an attaching-plate, an arm pivotally mounted and longitudinally adjustable on said plate, a iiositively-driven rotary grinding device mounted on the free end of said arm and mounted for continuous positive action upon the blade, means cooperating with the pivot of the said arm for changing the position of the grinding device to give the blade a long or short bevel, means for varying the pressure on the blade, operating means for the said. grinding device, and guide-pulleys for the operating means carried by the said plate.

2. An attachment for a band-saw machine, comprising a plate, an arm pi votally mounted on said plate and longitudinally adjustable thereon, a positively-driven grinding device, mounted on said arm for continuous positive action on the blade, means for longitudinal adjustment of the said arm to vary the bevel given to the blade, an adjustable band-saw guide-plate carried by said plate, and means on the said plate for engagement with the said arm for varying the pressure of the grinding device upon the blade.

3. An attachment for a band-saw machine,

an attaching-plate, an arm pivotally mounted thereon, a positively-driven rotary grinding device carried by the free end of said arm and mounted for continuous positive action upon the blade, means for varying the position of the grinding device to vary the bevel given to the blade, means for operating the grinding device, an adjustable band-saw guide-plate carried by said plate, and idlers adjustably and detachably mounted on said plate.

4:. In an attachment for a band-saw machine, a pivotally-mounted arm, means for adjusting the same longitudinally, a continuously-driven positivelyoperated rotary grinding device mounted to act positively and continuously upon the blade, a mandrel carried by the free end of said arm, a pulley on said mandrelupon one side of said arm, the grinding device being upon the opposite side, means on the plate for varying the pressure of the grinding device on the blade, an adjustable band-saw guide-plate, a drive-pulley located at the rear of the machine, idlers on some fixed part, and a drive-belt passed over said idlers and over the pulley on the mandrel.

5. In an attachment for a band-saw machine, an attaching-plate, an arm pivotally mounted thereon, a rotary grinder mounted on the free end of said arm, means fol-positively and continuously driving said grinder in positive continuous engagement With the blade, means for varying the bevel given to the blade, means for varying the pressure on the blade, and an adjustable band-saw guide-plate carried by said plate.

6. In an attachment of the character described, a pivotally-mounted and longitudinally-adjustable rocker-arm, a grinder carried thereby, means for varying its position to give a long or a short bevel to the knife, an adjustable band-saw guide-plate, means for varying the pressure of the grinder upon the knife, idler-pulleys at the rear of the machine, an attaching-plate carrying all of said parts to the blade, means for varying the pressure on the blade, an adjustable band-saw guideplate, and a tension-spring acting on said arm and connected With said plate.

8. An attachment of the character described comprising a plate, a pivotally mounted rocker-arm mounted for longitudinal adjustment on said plate, an emery-Wheel carried by the free end of the arm and positively driven andmounted for continuous action on the blade, means for adjusting the pivot of said arm, a sheave on the mandrel of the said wheel, a drive-pulley located at the rear of the machine, means for varying the bevel given to the blade, means for varying the pressure on the blade, an adjustable bandsaw guide-plate, and a drive-belt.

9. An attachment of the character described, comprising an attaching-plate, a rocker-arm pivoted thereon and having a bearing intermediate its ends on the outer end of said plate, a mandrel carried by the free end of said arm, a positively-driven grinder carried by the said mandrel, means on said plate engaging the rocker-arm near its free end, a spring on said plate acting in opposition to said means, and means on said plate for adjusting the pivot of the rocker-arm.

Signed by us at Leetonia this 16th day of January, 1904.

' ELMER HARROLD.

CLINTON Gr. WILDERSON. Witnesses:

JESSE STURGEON, (301m A. RANKIN. 

